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Am J Obstet Gynecol. 2009 May;200(5):580.e1-7. doi: 10.1016/j.ajog.2009.02.007.

The minimum important differences for the urinary scales of the Pelvic Floor Distress Inventory and Pelvic Floor Impact Questionnaire.

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  • 1Obstetrics, Gynecology, and Women's Health Institute, Cleveland Clinic, Cleveland, OH, USA.

Abstract

OBJECTIVE:

We sought to estimate the minimum important difference (MID) for the Urinary Distress Inventory (UDI), UDI-stress subscale of the Pelvic Floor Distress Inventory, and Urinary Impact Questionnaire (UIQ) of the Pelvic Floor Impact Questionnaire.

STUDY DESIGN:

We calculated MID using anchor- and distribution-based approaches from a randomized trial for nonsurgical stress incontinence treatment. Anchors included a global impression of change, incontinence episodes from a urinary diary, and the Incontinence Severity Index. Effect size and standard error of measurement were the distribution methods used.

RESULTS:

Anchor-based MIDs ranged from -22.4 to -6.4 points for the UDI, -16.5 to -4.6 points for the UDI-stress, and -17.0 to -6.5 points for the UIQ. These data were supported by 2 distribution-based estimates.

CONCLUSION:

Reasonable estimates of MID are 11, 8, and 16 points for the UDI, UDI-stress subscale, and UIQ, respectively. Statistically significant improvements that meet these thresholds should be considered clinically important.

PMID:
19375574
[PubMed - indexed for MEDLINE]
PMCID:
PMC2680021
Free PMC Article

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